tach signal

[aeklo]

I have a MB 230 ce '87 w124.

I am trying to find some sort of positive increasing tach-signal to use for a remote start kit.

The standard tach-siganl in the dash decreases by decreasing rpm.

I've tried to measure the wires at the coil, but they seem rock steady by rpm.

And, I guess, the sensor output at the test connector won't give me more than a few mV? I need at least a couple of volts in idle.
Pulses of 12V are OK, as long as they increase with rpm.

Any ideas? Are there a signal available at the distributor?

Thanks in advance!